/Engine/Source/Runtime/Core/Public/Misc/MapErrors.h
{Actor} : Static mesh actor has NULL StaticMeshComponent property - please delete!: This warning is caused when there is a static mesh actor with a "None" StaticMeshComponent component. It is usually found in older maps where duplication was used to create the actor and can be fixed by deleting the actor causing the warning and creating a new one.
static [FLazyName](API\Runtime\Core\UObject\FLazyName) StaticMeshComponent;